[link|http://en.wikipedia.org/wiki/Event_horizon|Event Horizon] at Wikipedia gives a similar account to you.

Jay writes:
The event horizon is a two way barrier, nothing on the inside can effect us and nothing on the outside can effect the inside.


I don't think this is quite right, as black holes can [link|http://en.wikipedia.org/wiki/Black_hole#Evaporation|evaporate] via [link|http://en.wikipedia.org/wiki/Hawking_radiation|Hawking radiation]. At least if you are convinced by the theories.

Cheers,
Scott.